Electrochemistry MCQ

The diagram shows an electrical cable.

Which statement about the substances used is correct?

• The coating is plastic because it conducts electricity well.

• The core is copper because it conducts electricity well.

• The core is copper because it is cheap and strong.

• The core is iron because it is cheap and strong.

When substance X is electrolysed, the amount of gases P and Q formed is shown.

What is substance X?

• concentrated aqueous sodium chloride

• concentrated hydrochloric acid

• dilute sulfuric acid

• molten lead(II) bromide

What are the products at the electrodes when dilute sulfuric acid is electrolysed using inert electrodes?

• A

• B

• C

• D

Electricity is passed separately through concentrated hydrochloric acid, concentrated aqueous sodium chloride and dilute sulfuric acid.

In which rows are the electrolysis products correctly named?

• 1, 2 and 3

• 1 and 2 only

• 1 and 3 only

• 2 and 3 only

Which row describes the electrolysis of molten potassium bromide?

• A

• B

• C

• D

The diagram shows a section of an overhead power cable.

Which statement explains why a particular substance is used?

• Aluminium has a low density and is a good conductor of electricity

• Ceramic is a good conductor of electricity.

• Steel can rust in damp air.

• Steel is more dense than aluminium.

The diagram shows the electrolysis of concentrated hydrochloric acid and concentrated aqueous sodium chloride using carbon electrodes.

At which electrode(s) is hydrogen produced?

• electrode 1 only

• electrodes 1 and 3

• electrode 2 only

• electrodes 2 and 4

What are the electrode products when molten silver iodide is electrolysed between inert electrodes?

• A

• B

• C

• D

Copper and hydrogen can each be formed by electrolysis.

At which electrodes are these elements formed?

• A

• B

• C

• D

The diagram shows a failed attempt to copper-plate a pan.

Which action will plate the pan with copper?

• cooling the copper sulfate solution in an ice bath

• heating the copper sulfate solution to boiling point

• increasing the voltage from 3V to 6V

• making the pan the cathode and the copper the anode